"John Whittingham" <[EMAIL PROTECTED]> wrote: >> They will. Sigma's "DG" lenses are full-frame but "optimized for >> digital" (I'm as suspicious of this digital optimization as herb Keppler >> is.) Their digital-only (small image circle) lenses are designated "DC". > >Thanks Mark, the 70-200 is still definitely an option then. I'm not familiar >with Keppler's opinion on digital optimization, would you care to elaborate >or post a link to the article?
He's asked for examples of both "old versions" and "digitally optimized version" of the same lens, along with suggestions as to what kind of photo situations will best reveal the improvements of the "optimization" so that he can compare the differences. So far no manufacturer has taken him up on it. He has drawn a somewhat cynical (but probably accurate) conclusion from this ;-) -- Mark Roberts Photography and writing www.robertstech.com
